I too have seen the bolt method work but this particular block is easy to find.
He should try to find the CE block, the BE block has a few minor casting differences which in some cases will be a problem (e.g. missing the generator mounts on early versions) and is pretty rare anyway. The CE blocks are very common since the B, C, CA, and IB all used these for the majority of the production run. They can be had for nearly nothing at salvage and metal scrap yards sometimes even from stationary applications (all crops, balers, choppers) that can work fine. I have seen these as cheap as 50 bucks. They will have the "CE" designation on the right rear flange. I know of many in yards here but the shipping would cost far more than the block itself, there must be some locally where you are.
Some of the stationary versions have a casting punchout for a cam driven fuel pump. This pump is hard to find but the hole can be blocked creating a cover and gasket. The fuel pump is unnessesary and undesirable if the engine is used on a tractor.